Population growth

Question 1

what results in population growth?

Answer 1

reproduction

Question 2

Population size is the

Answer 2

number of individuals alive at a particular place

Question 3

population size is influenced by

Answer 3

birth, death, immigration, emigration (individual leaves and becomes part of new population)

Question 4

B is

Answer 4

Births

Question 5

D is

Answer 5

deaths

Question 6

per capita birth rate (b) equation is

Answer 6

B/N

Question 7

per capita death rate (d) equation is

Answer 7

D/N

Question 8

per capita growth rate (r) equation is

Answer 8

b-d, or r= (B-D)/N0

Question 9

the change in total number of individuals in a population equation is

Answer 9

B-D

Question 10

we can use per capita growth rate to

Answer 10

predict population size

Question 11

if r>0

Answer 11

population is growing

Question 12

if r<0

Answer 12

population is shrinking

Question 13

the Exponential model of population growth (as time increase, population increase) tells us:

Answer 13

The per capita growth rate (r) will be
at a maximum (rmax) for that population (always increasing)
rmax is always positive in this graph

Question 14

what is Rmax

Answer 14

the intrinsic rate of increase (rate of increase if there were unlimited resources)

Question 15

in bacteria, Rmax is

Answer 15

10

Question 16

in mammals (large), Rmax is

Answer 16

0.001

Question 17

Bigger organisms have ____ rmax

Answer 17

less

Question 18

Smaller organisms: _____ rmax

Answer 18

greater

Question 19

what affects generation time and rmax?

Answer 19

Time before sexual maturity
Gestation time
Lifespan

Question 20

the size of the population growing exponentially is given by

Answer 20

Nt, where they give the times

Question 21

What limits population growth

Answer 21

Predation
Limited food
Limited shelter
Disease
Abiotic Environment: temp, precipitation

Question 22

Carrying Capacity is given by

Answer 22

K

Question 23

what is carrying Capacity

Answer 23

the max population size that the environment can hold, given by K

Question 24

what determines the growth rate (r )

Answer 24

how close the population size (N) is to the carrying capacity (K)

Question 25

r changes with N in the

Answer 25

logistic population growth graph

Question 26

Population size symbol is:

Answer 26

N

Question 27

in the N vs r logistic population growth graph, as N _____, growth rate ______

Answer 27

increases
decreases

Question 28

in the N vs r logistic population growth graph when N=K…..

Answer 28

r=0

Question 29

in the N vs r logistic population growth graph when N>K….

Answer 29

r<0 (population is shrinkng)

Question 30

in the time vs N logistic population growth graph….r is ______
and _____ as individuals ______

Answer 30

r is the slope
r decreases as individuals increase

Question 31

rt is the _____

Answer 31

rate of increase at a certain time

Question 32

in the time vs N logistic population growth graph, K is _______

Answer 32

the asymptote

Question 33

factors that influence Population growth have an increasing effect as _________

Answer 33

N becomes large

Question 34

Biotic factors that affect population growth (density dependent):

Answer 34

competition for food,
shelter,
predation,
access to mates,
disease

Question 35

Crowding (density- dependent) influences:

Answer 35

reproduction
growth rate
adult size
survival
ex. as there is more seed density, there is less seed productivity
as there is more plants, there’s is less growth in plant
as there is more birds, the probability of them surviving is zero

Question 36

Abiotic factor that influence population growth (density independent):

Answer 36

Temp
Precipitation
Disturbances (fires, floods)

Question 37

Density independent factor have affect at:

Answer 37

any population size

Question 38

R-selected species are/have :

Answer 38

small body size
in environments where disturbance is common
High growth rate
Low survivorship
Semelparous : big reproduction all at once
Short lifespan
High fecundity

Question 39

K-selected species are/have:

Answer 39

iteroparous
large size
long lifespan
later reproduction
slower growth rates